Jay Z has signed Steven Spielberg's children to his management company.

The rap mogul was one of several music bosses impressed by indie duo Wardell - comprising the Hollywood director and actress Kate Capshaw's children Sasha and Theo - at the South By Southwest festival earlier this year, and the pair have now inked deals with his Roc Nation group.

Sahsa, 23, has previously acted in films including her father's 'Indiana Jones And The Kingdom Of The Crystal Skull' and sings in the band, while Theo - who is adopted - is responsible for the group's music.

The band will release their debut album next year and promise a ''comfortable and chill'' sound.

Their profile page on Roc Nation's website reads: ''Sasha and Theo are brother and sister.

''That familiarity and fondness informs the music that they make together, which is at once warm and summery, comfortable and chill as a result of their Los Angeles upbringing.''

Wardell are in good company in signing management deals with Roc Nation.

The firm is also responsible for the affairs of stars including Kylie Minogue, Haim, Shakira, Rihanna, Calvin Harris and Rita Ora.